Synopsis
Oxygen uptake (Vo 2) was measured in carp of approximately 40 cm length swimming at controlled variable oxygen tensions (Po 2). At Po 2> 120 mm Hg Vo 2 increased with an increase in swimming speed from 5.6 to 11.3 cm · sec−1. Extrapolation of Vo 2 to zero activity at Po 2 = 140 mm Hg revealed a standard O2 uptake of 36.7 ml O2 · kg−1 · h−1 at 20° C. At the lowest swimming speed (5.6 cm · s−1) the oxygen uptake increased when the water Po 2 was reduced. A near doubling in Vo 2 was seen at Po 2 = 70 mm Hg compared to 140 mm Hg. At higher swimming speeds in hypoxic water Vo 2 decreased relative to the values at low swimming speeds. As a result the slope of the lines expressing log Vo 2 as a function of swimming speed decreased from positive to negative values with decreasing Po 2 of the water. pH of blood from the caudal vein drawn before and at termination of swimming at Po 2 = 70 mm Hg and 100 mm Hg did not show any decrease in relation to rest values at Po 2 = 140 mm Hg. Blood lactate concentration did not increase during swimming at these tensions.
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Christiansen, B., Lomholt, J.P. & Johansen, K. Oxygen uptake of carp, Cyprinus carpio, swimming in normoxic and hypoxic water. Environ Biol Fish 7, 291–296 (1982). https://doi.org/10.1007/BF00002504
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DOI: https://doi.org/10.1007/BF00002504